EP1617541B1 - Entraînement direct avec un détecteur de position angulaire - Google Patents

Entraînement direct avec un détecteur de position angulaire Download PDF

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Publication number
EP1617541B1
EP1617541B1 EP20050014909 EP05014909A EP1617541B1 EP 1617541 B1 EP1617541 B1 EP 1617541B1 EP 20050014909 EP20050014909 EP 20050014909 EP 05014909 A EP05014909 A EP 05014909A EP 1617541 B1 EP1617541 B1 EP 1617541B1
Authority
EP
European Patent Office
Prior art keywords
drive shaft
rotor
rotary
direct drive
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP20050014909
Other languages
German (de)
English (en)
Other versions
EP1617541A1 (fr
Inventor
Bernd Dr. Schnurr
Peter Schuh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Rexroth AG
Original Assignee
Bosch Rexroth AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bosch Rexroth AG filed Critical Bosch Rexroth AG
Publication of EP1617541A1 publication Critical patent/EP1617541A1/fr
Application granted granted Critical
Publication of EP1617541B1 publication Critical patent/EP1617541B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K26/00—Machines adapted to function as torque motors, i.e. to exert a torque when stalled
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices

Definitions

  • the invention relates to a direct drive with a housing in which an outer stator and an inner, designed as a hollow shaft rotor are arranged separated by an air gap, the rotor with a mounted on the housing, fixed with an end portion extending through the rotor drive shaft connected, and wherein a rotary encoder is arranged on the drive shaft, wherein the rotor extending into the end portion of the drive shaft has a recess in which a permanent rotation angle detection serving rotary encoder is arranged.
  • Direct drives with torque motors are mainly used in industrial applications where drives with high torque are required at low speeds.
  • Torque motors are permanent-magnet synchronous motors in which the inner rotor is designed as a hollow shaft, in which a drive shaft can be introduced directly without the interposition of a transmission.
  • Direct drives with torque motors are mainly used for swivel axes and rotary tables of machine tools, but also used in the plastics industry as a drive for extruder screws or as a rolling drive in Folienziehmaschinen or printing machines.
  • a permanent rotation angle detection of the rotor is required. From the angle information of the rotary encoder, the position of the rotor or the drive shaft arranged thereon can be determined. The electrical output signals of the rotary encoder are then fed to a Ltdutier Kunststoffung, which ensures a phase-correct energization of the stator windings of the stator:
  • the rotary encoder is in the Usually on the drive shaft of the direct drive, which is firmly connected to the rotor, arranged and designed as a rotary encoder or hollow shaft encoder.
  • the rotary encoder has a rotary shaft, which is in firm engagement with the drive shaft of the direct drive and.
  • the drive shaft or rotor position transmits to the rotary encoder and converts it into an electrical signal.
  • the hollow shaft encoder is equipped with a hollow shaft, which is arranged above the drive shaft and non-rotatably connected thereto, to transmit the torque from the drive shaft to the hollow shaft encoder and convert it into an electrical signal.
  • the direct drive with torque motor is characterized by a compact design, in which the diameter is usually relatively large in relation to the length.
  • the length of the direct drive with torque motor in the known versions is essentially determined by the rotary encoder.
  • the drive shaft extends through the rotor designed as a hollow shaft and is mounted in each case laterally from the rotor on the two end sides of the housing.
  • a rotary encoder is then placed on an end face of the drive shaft and protrudes so far out of the housing of the direct drive, resulting in a larger overall length of the direct drive.
  • the protruding from the housing rotary encoder can be easily damaged.
  • a direct drive with a housing known in which an external stator and an inner designed as a hollow shaft rotor are arranged separated by an air gap.
  • the rotor is fixedly connected to a housing mounted on the, with an end portion extending through the rotor drive shaft
  • a rotary encoder is rotatably mounted on the drive shaft.
  • the extending in the rotor end portion of the drive shaft has a recess in which the rotary encoder is arranged.
  • the DE 102 28 856 A1 describes a direct drive for a throttle shaft in a throttle body.
  • This drive consists of a coil and a rotor arranged directly next to the coil.
  • the rotor consists of a steel ring in which inside a first inner magnetic shell and a second inner magnetic shell lie opposite each other.
  • the steel ring On the outside, the steel ring has a first outer magnetic shell and a second outer magnetic shell, which lie opposite one another.
  • the steel ring is connected to the throttle shaft.
  • a sensor for detecting the position of the throttle valve is arranged centrally.
  • Object of the present invention is to achieve a reduction of the space of a direct drive with rotary encoder.
  • the direct drive according to the invention with a torque motor in which the rotor is designed as an internal hollow shaft through which the drive shaft extends, is characterized in that the extending in the rotor end portion of the drive shaft designed in two parts, with a T-shaped front part and formed as a sleeve-shaped or hollow shaft rear part, which are each mounted separately on the rotor and mounted on the housing, wherein the rotary encoder of the drive shaft is arranged in the sleeve-shaped rear part of the drive shaft and rotatably secured to the front part of the drive shaft.
  • This design of the drive shaft allows a particularly compact design, as left by the division of the drive shaft, a large installation space for the rotary encoder in the drive shaft.
  • the extending in the rotor end portion of the drive shaft with a front floating bearing and a rear fixed bearing is mounted on the housing.
  • a cup-shaped insert flanged onto the housing is provided in which the rotary encoder is arranged.
  • the rotary encoder is a rotary encoder having an axis of rotation which is fixedly connected to the drive shaft.
  • the use of a rotary encoder allows a cost-effective Drehwinkelgeberauslegung.
  • the axis of rotation of the rotary encoder is preferably connected in a rotationally fixed manner to an insert provided centrally in the drive shaft, which allows a simple mounting of the rotary encoder on the drive shaft.
  • the direct drive to drive a roller, wherein the drive shaft is connected via a torsionally rigid coupling with the roller.
  • the connection of the direct drive to the roller via a torsionally rigid coupling allows easy alignment of drive shaft and roller with simultaneous ability to compensate for axial displacements between the drive shaft and roller on the torsionally rigid coupling.
  • the direct drive according to the invention is represented by the example of a feed roller arrangement, as used in film drawing or printing machines.
  • the direct drive according to the invention can be used as a drive in any industrial applications in which in particular a high torque at low speed are required.
  • FIG. 1 shows in longitudinal section a feed roller assembly 1, with a substantially U-shaped in cross-section housing 11 in which one above the other by a conveying gap spaced two rollers 12, 13 are arranged.
  • the two rollers 12, 13 each have laterally protruding shafts 121, 122, 131, 132 which are each rotatably mounted on the housing 11 by means of an axial bearing 141, 142, 151, 152.
  • Each of the two rollers is driven separately from a direct drive 2, 3.
  • FIG. 2 shows the left direct drive in an enlarged view, wherein FIG. 2A a longitudinal section, FIG. 2B a backside supervision and Figure 2C show the direct drive in exploded view.
  • the direct drive 2 is designed as a permanently excited rotary direct drive according to the torque motor principle with a high power density and a compact design.
  • the direct drive is housed in a cylindrical housing 21 in which the diameter is relatively large in relation to its length.
  • a cylindrical stator pack 22 Arranged in the housing 21 and fixedly connected thereto is a cylindrical stator pack 22 with a high-pole stator winding.
  • the stator 22 has a lateral power connection 23, via which a multi-core power cable 24 is connected to the stator.
  • the motor current supplied via the power cable ensures a circulating magnetic field in the stator windings.
  • a cylinder-shaped rotor packet 25 In the cylindrical stator 22 fixedly connected to the housing 21, a cylinder-shaped rotor packet 25, likewise cylindrical, is disposed with an outer disk-shaped magnet spaced apart by an air gap, which is set in rotational motion by the rotating magnetic field.
  • the rotor 25 in turn is fixedly connected to a drive shaft 26.
  • This drive shaft 26 is designed in two parts, with a front T-shaped shaft portion 261 and a rear sleeve-shaped shaft portion 262.
  • the T-shaped shaft portion 261 in turn has a three-stage lateral surface, wherein at a first step portion, an outer mounting ring 263 is arranged, the a first end face of the rotor 25 rests and is screwed thereto via cylinder screws 27.
  • the sleeve-shaped shaft portion 262 is formed slightly tapered and provided with a mounting ring 264 which is screwed via cylinder screws 27 with a second end face of the rotor 25.
  • the front T-shaped drive shaft section 261 is mounted in front of the stator 22 in the front region of the housing 21 via a floating bearing 28, which is designed in three parts.
  • the movable bearing 28 has an annular insert 281 which is connected to the housing 21. Between this bearing insert 281 and the T-shaped drive shaft portion 261, an annular ball bearing 282 is arranged axially movable, which is closed by an annular bearing cap 283.
  • the axially movable arrangement of the floating bearing 28 provides sufficient clearance to compensate for particular temperature expansions of the drive shaft and the motor housing during operation.
  • the T-shaped drive shaft portion 261 is mounted on the floating bearing 28 on the housing 21 that it over protrudes the bearing cap 283 with its front step portion.
  • the rear sleeve-shaped drive shaft section 262 is mounted on the housing 21 via a three-part fixed bearing 29.
  • the three-part fixed bearing has a housing securing ring 291, which secures the drive shaft section 262 with the rotor 25 attached thereto axially to the housing 21.
  • On this locking ring 291 sits between the housing 21 and the rear drive shaft portion 262, a ball bearing 292, which in turn is held by an annular bearing cap 293.
  • a cup-shaped insert 30 is further arranged, which is fixedly flanged to the bearing cap 293 of the fixed bearing 29.
  • a cylindrical rotary encoder 31 is arranged in the cup-shaped insert 30, in turn, a cylindrical rotary encoder 31 is arranged.
  • This cylindrical rotary encoder 31 is designed in the illustrated embodiment as an absolute rotary encoder and has a projecting axis of rotation 311 which is in engagement with an insert 265 in the T-shaped drive shaft portion 261.
  • This rotary encoder 31 serves to detect the rotation angle of the drive shaft 26 and the attached rotor 25 and convert it into an electrical signal, which is supplied via a protruding from the pot-shaped insert cable 32 Medutier Kunststoffung (not shown).
  • the scanning of the angular position of the drive shaft 26 is contactless and wear-free via optical elements.
  • a code disc is arranged, which is irradiated with light. The resulting on a fixed aperture in the absolute encoder then bright-dark pattern indicating the angular position of the drive shaft is converted into an electrical signal and transmitted to the commutation for further signal processing.
  • the rotary encoder can also be designed as a single-turn encoder or resolver or gear wheel encoder.
  • the inventive arrangement of the rotary encoder directly in the drive itself can be a highly compact design of the direct drive with a very short length realize. Furthermore, the encoder is protected by the internal arrangement in the direct drive against damage.
  • other rotary encoders e.g. Hollow shaft encoder can be used. Such a hollow shaft encoder would then be the non-rotatably slid over a designated wave-shaped portion on the front drive shaft portion to detect the rotational movement of the drive shaft.
  • the two in FIG. 1 shown permanently excited rotary direct drives 2, 3 are screwed via a cylindrical flange 4 with the frame 11 of the feed roller assembly.
  • the front T-shaped drive shaft part 261 is fixedly connected via a torsionally rigid coupling 5 with the shaft extension 131 of the associated roller 13.
  • the torsionally rigid coupling 5 ensures a reliable alignment of the drive shaft 29 and the roller 13 and compensates for it In addition, axial displacements between roller 13 and drive shaft 29 from.
  • the two direct drives 2, 3 are synchronized via their Kommutator horrungen (not shown) to drive the two feed rollers 12, 13 synchronously.
  • the drive of the rollers is carried out so that the stator windings are supplied via the associated Kommutator horrungen the direct drive circumferentially with motor current, the switching speed determines the speed.
  • the rotating magnetic field forming in the stator windings generates a corresponding rotary field in the rotor, wherein the torque is proportional to the injected motor current.
  • This torque is then transmitted from the rotor to the drive shaft and from there via the torsionally rigid coupling to the roller.
  • the internal rotary encoder of the direct drive which is connected to the drive roller, thereby scans the angular position of the drive shaft and thus the rotor position to adjust the speed and torque via a feedback to the Medutier horrung.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Claims (7)

  1. Entraînement direct comportant un boîtier (21) logeant un stator extérieur (22) et un rotor intérieur (24) en forme d'arbre creux, séparés par un entrefer,
    le rotor étant relié solidairement à un arbre d'entraînement (26) dont le segment d'extrémité traverse le rotor et qui est monté dans le boîtier, et un détecteur d'angle de rotation (31) est solidaire en rotation de l'arbre d'entraînement,
    le segment d'extrémité de l'arbre d'entraînement (26) qui pénètre dans le rotor (25) comporte une cavité logeant un capteur d'angle de rotation, caractérisé en ce que
    le segment d'extrémité de l'arbre d'entraînement (26) qui s'étend dans le rotor (25) est formé de deux parties, une partie avant (261) en forme de T et un segment d'arbre (262), arrière, en forme de manchon, ces parties étant fixée séparément au rotor et montées dans le boîtier (21),
    le détecteur d'angle de rotation (31) étant logé dans la partie arrière en forme de manchon de l'arbre d'entraînement est fixé solidairement en rotation à la partie avant de l'arbre d'entraînement.
  2. Entraînement direct selon la revendication 1,
    caractérisé en ce que
    le segment d'extrémité de l'arbre d'entraînement (26) qui arrive dans le rotor (25) est monté dans le boîtier (21) par un palier avant (28) libre et un palier arrière (29) fixe.
  3. Entraînement direct selon l'une quelconque des revendications 1 et 2,
    caractérisé en ce qu'
    un insert (30) en forme de pot, fixé par bride au boîtier (21) reçoit le détecteur d'angle de rotation (31).
  4. Entraînement direct selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    le détecteur d'angle de rotation (31) est un détecteur de rotation ayant un axe de rotation (311) relié solidairement à l'arbre d'entraînement.
  5. Entraînement direct selon la revendication 4,
    caractérisé en ce que
    l'arbre d'entraînement (25) présente en son milieu un insert (265) dans lequel pénètre l'axe de rotation (311) du détecteur de rotation (31).
  6. Entraînement direct selon l'une quelconque des revendications 4 ou 5,
    caractérisé en ce que
    le détecteur de rotation (31) est un détecteur de rotation absolu ou un détecteur de tour unique ou un résolveur ou un détecteur à roues dentées.
  7. Entraînement direct selon l'une quelconque des revendications 1 à 6, pour l'entraînement d'un cylindre (12),
    caractérisé en ce que
    l'arbre d'entraînement (21) est relié au cylindre (12) par un embrayage (5) solidaire en rotation.
EP20050014909 2004-07-16 2005-07-09 Entraînement direct avec un détecteur de position angulaire Expired - Fee Related EP1617541B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200410034636 DE102004034636A1 (de) 2004-07-16 2004-07-16 Direktantrieb mit Drehwinkelgeber

Publications (2)

Publication Number Publication Date
EP1617541A1 EP1617541A1 (fr) 2006-01-18
EP1617541B1 true EP1617541B1 (fr) 2008-05-07

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ID=34937815

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050014909 Expired - Fee Related EP1617541B1 (fr) 2004-07-16 2005-07-09 Entraînement direct avec un détecteur de position angulaire

Country Status (2)

Country Link
EP (1) EP1617541B1 (fr)
DE (2) DE102004034636A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019162955A1 (fr) * 2018-02-22 2019-08-29 Patel Harshit Moteur à couple sans engrenage à entraînement direct sans cadre

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006040232A1 (de) * 2006-08-28 2008-03-13 Siemens Ag Türantrieb für eine automatische Tür
EP2061136A1 (fr) * 2007-11-19 2009-05-20 Siemens Aktiengesellschaft Engrenage direct électrique pour un cylindre
DE102009012168A1 (de) 2009-03-06 2010-09-09 Robert Bosch Gmbh Wellenenergieanlage
ES2899379T3 (es) 2017-04-12 2022-03-11 Epsilon Kran Gmbh Accionamiento de rotación

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2624669A1 (fr) * 1987-12-11 1989-06-16 Banon Louis Dispositif de detection de position pour moteur electrique
DE10228856A1 (de) * 2002-06-27 2004-01-22 Siemens Ag Direktantrieb für eine Drosselklappenwelle in einem Drosselklappenstutzen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019162955A1 (fr) * 2018-02-22 2019-08-29 Patel Harshit Moteur à couple sans engrenage à entraînement direct sans cadre

Also Published As

Publication number Publication date
DE102004034636A1 (de) 2006-02-16
EP1617541A1 (fr) 2006-01-18
DE502005003948D1 (de) 2008-06-19

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